//The function which can accept a pointer, can also accept an array as shown in the following example:
#include <iostream>
using namespace std;
 
// function declaration:
double getAverage(int *arr, int size);
 
int main ()
{
   // an int array with 5 elements.
   int balance[5] = {1000, 2, 3, 17, 50};
   double avg;
 
   // pass pointer to the array as an argument.
   avg = getAverage( balance, 5 ) ;
 
   // output the returned value 
   cout << "Average value is: " << avg << endl; 
    
   return 0;
}

double getAverage(int *arr, int size)
{
  int    i, sum = 0;       
  double avg;          
 
  for (i = 0; i < size; ++i)
  {
    sum += arr[i];
   }
 
  avg = double(sum) / size;
 
  return avg;
}